Honestly, I kind of disagree. Culturally we're shifting towards the TikTok attitude of "I am filming the movie's highlights and posting them on social media to get views" If anything we're entering an era where it's almost impossible to avoid spoilers as a result of that attitude specifically.
DionysiaI would say it is an increase, in the sense that there is a noticeable shift, culturally, in what people consider a spoiler and how strongly people react when what they feel to be a spoiler is breached. They are individuals, but individuals are influenced by cultural expectations.